我如何优化或加速以下 sql 查询？
How can i optimize or speed up the following sql query?
所以我有以下 SQL 查询，顺便说一下，它在数据提取方面工作得很好。唯一的问题是检索数据需要很长时间。
select distinct cast(bb.idPrefix as varchar)+'-'+cast(bb.id as varchar) as 'TicketID',
bb.Title,
bb.Description,
bb.Submitter,
bb.IssueType,
bb.ProgressStatus as 'Status',
bb.Resolution,
bb.CurrentOwner as 'Assignee',
bb.TimeEstimated / 60 as 'TimeEstimated (minutes)',
bb.TimeRemaining /60 as 'TimeRemaining (minutes)',
bb.TimeLogged /60 as 'TimeSpent (minutes)',
bb.Projectname ,
case when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.Id GROUP BY id HAVING COUNT(*) > 1) >1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc)
when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) >1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc)
else null end as 'End Sprint',
case when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) > 1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid Asc)
when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) > 1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid Asc) end as 'Start Sprint',
case when bb.resolution is null and bb.TimeEstimated is null and bb.CurrentOwner is null then 1 else 0 end as 'Backlog',
case when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),15,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),16,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,3)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),13,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,3) else 0 end as [StartCO],
case when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),15,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),16,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,3)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),13,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,3) else 0 end as [EndCO]
from project.bugs bb
left join project.sprint bs on
bb.id = bs.id
left join project.logs l on
bb.id = l.id
where bb.projectid = 18540
and bb.IssueType = 'tracking' and bb.idPrefix like 'Test%' and (bb.title like '%XXXXX%auto%' or bb.title like '%YYY%auto%')
有什么想法可以改变以加快此过程吗？
这里满是我添加的评论。有人注意到所需的行为是 unknown/impossible 所以需要解决。但是，我相信我重写了正确的逻辑。我摆脱了几乎所有的子查询栏 2；我将其余部分移至 OUTER APPLY 中的 FROM。当然，这是不可能测试的，因为我没有样本数据，也没有预期的结果，但是 SQL 确实 解析：
SELECT CAST(bb.idPrefix AS varchar) + '-' + CAST(bb.id AS varchar) AS TicketID, --Don't use single quotes for aliases, they are for literal strings
bb.Title,
bb.Description,
bb.Submitter,
bb.IssueType,
bb.ProgressStatus AS Status,--Don't use single quotes for aliases, they are for literal strings
bb.Resolution,
bb.CurrentOwner AS Assignee,--Don't use single quotes for aliases, they are for literal strings
bb.TimeEstimated / 60 AS TimeEstimatedMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.TimeRemaining / 60 AS TimeRemainingMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.TimeLogged / 60 AS TimeSpentMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.Projectname,
CASE
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.Id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
GROUP BY id) > 1 THEN SNx.SprintName
--This will never be true, it's the same as the last WHEN
/*
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
GROUP BY id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
HAVING COUNT(*) > 1) > 1 THEN SNy.SprintName
*/
--ELSE NULL is redundant, a CASE expression already returns NULL if it doesn't evaluate to TRUE
END AS EndSprint, --Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
CASE
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
GROUP BY id) > 1 THEN SNx.SprintName
--This will never be true, it's the same as the last WHEN
/*
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
GROUP BY id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
HAVING COUNT(*) > 1) > 1 THEN SNy.SprintName
*/
--ELSE NULL is redundant, a CASE expression already returns NULL if it doesn't evaluate to TRUE
END AS StartSprint, --Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
CASE
WHEN bb.resolution IS NULL
AND bb.TimeEstimated IS NULL
AND bb.CurrentOwner IS NULL THEN 1
ELSE 0
END AS Backlog, --Don't use single quotes for aliases, they are for literal strings
CASE
WHEN SUBSTRING(SNx.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 1)
WHEN SUBSTRING(SNx.SprintName, 15, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 2)
WHEN SUBSTRING(SNx.SprintName, 16, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 3)
WHEN SUBSTRING(SNy.SprintName, 12, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 1)
WHEN SUBSTRING(SNy.SprintName, 13, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 2)
WHEN SUBSTRING(SNy.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 3)
ELSE 0
END AS StartCO,
CASE
WHEN SUBSTRING(SNx.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 1)
WHEN SUBSTRING(SNx.SprintName, 15, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 2)
WHEN SUBSTRING(SNx.SprintName, 16, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 3)
WHEN SUBSTRING(SNy.SprintName, 12, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 1)
WHEN SUBSTRING(SNy.SprintName, 13, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 2)
WHEN SUBSTRING(SNy.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 3)
ELSE 0
END AS EndCO
FROM project.bugs bb
OUTER APPLY (SELECT TOP 1
s.SprintName
FROM project.sprint s
WHERE s.id = bb.id
AND bb.projectid = 12345
AND s.sprintname LIKE 'XXXXX sprint%'
ORDER BY s.sprintid ASC) SNx
OUTER APPLY (SELECT TOP 1
s.SprintName
FROM project.sprint s
WHERE s.id = bb.id
AND bb.projectid = 12345
AND s.sprintname LIKE 'YYY sprint%'
ORDER BY s.sprintid ASC) SNy
WHERE bb.projectid = 18540
AND bb.IssueType = 'tracking'
AND bb.idPrefix LIKE 'Test%'
AND (bb.title LIKE '%XXXXX%auto%' --This will never be SARGable due to leading wildcard.
OR bb.title LIKE '%YYY%auto%'); --This will never be SARGable due to leading wildcard.
当然，索引是另一回事，但如果没有对象的完整 DDL 和 DML 以及执行计划（如果结果正确，则该查询的执行计划），我什至不会在这里开始娱乐。
使用 WITH 语句分解常见查询。这是 SQL 服务器中的 CTE 或通用 Table 表达式。
您不必在 WITH 语句中执行整个子查询，只需简化数据即可。
例如：
WITH MY_SPRINT_QUERY AS
{
select Id, SprintName, sprintId from project.sprint
where
(sprintname like "XXXXX sprint%")
OR
(sprintname like "YYY sprint%")
}
SELECT <insert your simplified query here>
所以我有以下 SQL 查询，顺便说一下，它在数据提取方面工作得很好。唯一的问题是检索数据需要很长时间。
select distinct cast(bb.idPrefix as varchar)+'-'+cast(bb.id as varchar) as 'TicketID',
bb.Title,
bb.Description,
bb.Submitter,
bb.IssueType,
bb.ProgressStatus as 'Status',
bb.Resolution,
bb.CurrentOwner as 'Assignee',
bb.TimeEstimated / 60 as 'TimeEstimated (minutes)',
bb.TimeRemaining /60 as 'TimeRemaining (minutes)',
bb.TimeLogged /60 as 'TimeSpent (minutes)',
bb.Projectname ,
case when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.Id GROUP BY id HAVING COUNT(*) > 1) >1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc)
when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) >1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc)
else null end as 'End Sprint',
case when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) > 1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid Asc)
when bb.id in (Select id from project.sprint GROUP BY id HAVING COUNT(*) > 1) and
(Select count(*) from project.sprint where id = bb.id GROUP BY id HAVING COUNT(*) > 1) > 1 then
(select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid Asc) end as 'Start Sprint',
case when bb.resolution is null and bb.TimeEstimated is null and bb.CurrentOwner is null then 1 else 0 end as 'Backlog',
case when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),15,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),16,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid asc),14,3)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),13,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid asc),12,3) else 0 end as [StartCO],
case when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),15,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),16,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'XXXXX sprint%' order by sprintid desc),14,3)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,1)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),13,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,2)
when substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),14,1) like '[0-9]' then substring((select top 1 SprintName from project.sprint where id = bb.id and bb.projectid = 12345 and sprintname like 'YYY sprint%' order by sprintid desc),12,3) else 0 end as [EndCO]
from project.bugs bb
left join project.sprint bs on
bb.id = bs.id
left join project.logs l on
bb.id = l.id
where bb.projectid = 18540
and bb.IssueType = 'tracking' and bb.idPrefix like 'Test%' and (bb.title like '%XXXXX%auto%' or bb.title like '%YYY%auto%')
有什么想法可以改变以加快此过程吗？
这里满是我添加的评论。有人注意到所需的行为是 unknown/impossible 所以需要解决。但是，我相信我重写了正确的逻辑。我摆脱了几乎所有的子查询栏 2；我将其余部分移至 OUTER APPLY 中的 FROM。当然，这是不可能测试的，因为我没有样本数据，也没有预期的结果，但是 SQL 确实 解析：
SELECT CAST(bb.idPrefix AS varchar) + '-' + CAST(bb.id AS varchar) AS TicketID, --Don't use single quotes for aliases, they are for literal strings
bb.Title,
bb.Description,
bb.Submitter,
bb.IssueType,
bb.ProgressStatus AS Status,--Don't use single quotes for aliases, they are for literal strings
bb.Resolution,
bb.CurrentOwner AS Assignee,--Don't use single quotes for aliases, they are for literal strings
bb.TimeEstimated / 60 AS TimeEstimatedMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.TimeRemaining / 60 AS TimeRemainingMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.TimeLogged / 60 AS TimeSpentMinutes,--Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
bb.Projectname,
CASE
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.Id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
GROUP BY id) > 1 THEN SNx.SprintName
--This will never be true, it's the same as the last WHEN
/*
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
GROUP BY id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
HAVING COUNT(*) > 1) > 1 THEN SNy.SprintName
*/
--ELSE NULL is redundant, a CASE expression already returns NULL if it doesn't evaluate to TRUE
END AS EndSprint, --Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
CASE
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
GROUP BY id) > 1 THEN SNx.SprintName
--This will never be true, it's the same as the last WHEN
/*
WHEN (SELECT COUNT(*)
FROM project.sprint s
WHERE s.id = bb.id
GROUP BY id
--HAVING is pointless when you're checking in the CASE. If you want to use a HAVING use EXISTS in the CASE
HAVING COUNT(*) > 1) > 1 THEN SNy.SprintName
*/
--ELSE NULL is redundant, a CASE expression already returns NULL if it doesn't evaluate to TRUE
END AS StartSprint, --Don't use single quotes for aliases, they are for literal strings. Also, stick to names that don't need delimit identifing
CASE
WHEN bb.resolution IS NULL
AND bb.TimeEstimated IS NULL
AND bb.CurrentOwner IS NULL THEN 1
ELSE 0
END AS Backlog, --Don't use single quotes for aliases, they are for literal strings
CASE
WHEN SUBSTRING(SNx.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 1)
WHEN SUBSTRING(SNx.SprintName, 15, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 2)
WHEN SUBSTRING(SNx.SprintName, 16, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 3)
WHEN SUBSTRING(SNy.SprintName, 12, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 1)
WHEN SUBSTRING(SNy.SprintName, 13, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 2)
WHEN SUBSTRING(SNy.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 3)
ELSE 0
END AS StartCO,
CASE
WHEN SUBSTRING(SNx.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 1)
WHEN SUBSTRING(SNx.SprintName, 15, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 2)
WHEN SUBSTRING(SNx.SprintName, 16, 1) LIKE '[0-9]' THEN SUBSTRING(SNx.SprintName, 14, 3)
WHEN SUBSTRING(SNy.SprintName, 12, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 1)
WHEN SUBSTRING(SNy.SprintName, 13, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 2)
WHEN SUBSTRING(SNy.SprintName, 14, 1) LIKE '[0-9]' THEN SUBSTRING(SNy.SprintName, 12, 3)
ELSE 0
END AS EndCO
FROM project.bugs bb
OUTER APPLY (SELECT TOP 1
s.SprintName
FROM project.sprint s
WHERE s.id = bb.id
AND bb.projectid = 12345
AND s.sprintname LIKE 'XXXXX sprint%'
ORDER BY s.sprintid ASC) SNx
OUTER APPLY (SELECT TOP 1
s.SprintName
FROM project.sprint s
WHERE s.id = bb.id
AND bb.projectid = 12345
AND s.sprintname LIKE 'YYY sprint%'
ORDER BY s.sprintid ASC) SNy
WHERE bb.projectid = 18540
AND bb.IssueType = 'tracking'
AND bb.idPrefix LIKE 'Test%'
AND (bb.title LIKE '%XXXXX%auto%' --This will never be SARGable due to leading wildcard.
OR bb.title LIKE '%YYY%auto%'); --This will never be SARGable due to leading wildcard.
当然，索引是另一回事，但如果没有对象的完整 DDL 和 DML 以及执行计划（如果结果正确，则该查询的执行计划），我什至不会在这里开始娱乐。
使用 WITH 语句分解常见查询。这是 SQL 服务器中的 CTE 或通用 Table 表达式。
您不必在 WITH 语句中执行整个子查询，只需简化数据即可。
例如：
WITH MY_SPRINT_QUERY AS
{
select Id, SprintName, sprintId from project.sprint
where
(sprintname like "XXXXX sprint%")
OR
(sprintname like "YYY sprint%")
}
SELECT <insert your simplified query here>